Charge method, adapter and mobile terminal

ABSTRACT

A charge method, an adapter and a mobile terminal are provided. The adapter negotiates with the mobile terminal about the charging mode and the charging current of the battery. When determining to charge the battery in the quick charging mode, the adapter adopts the unidirectional pulse current to perform a quick charge on the battery using the negotiated charging current.

CROSS-REFERENCE TO RELATED APPLICATION

The present application is a continuation application of InternationalApplication No. PCT/CN2016/073679, filed with the State IntellectualProperty Office of P. R. China on Feb. 5, 2016, the entirety contents ofwhich are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure generally relates to mobile terminal field, andmore particularly, to a charge method, an adapter and a mobile terminal.

BACKGROUND

Nowadays, mobile terminals (such as smart phones) are more and morefavored by customers. However, since the power consumption of the mobileterminal is too large, it is required to charge the mobile terminalfrequently.

FIG. 1 illustrates a schematic diagram of an internal structure of anadapter. It can be seen from FIG. 1 that, the adapter is typicallyprovided with a transformer, a rectifying circuit and a filter circuitinternally. The rectifying circuit may include a primary rectifyingcircuit and a secondary rectifying circuit. The filter circuit mayinclude a primary filter circuit and a secondary filter circuit. Inaddition, the adapter may further include a pulse width modulation (PWM)control circuit or other circuits. The transformer may perform a voltagetransformation and an isolation on the mains voltage (such as, 220V), soas to convert it to a working voltage (such as, 5V) of the adapter. Thefilter circuit is typically a bridge circuit, which may convertalternating current having positive and negative directions changedalternately into unidirectional current. That is, after rectification,output current of the rectifying circuit is typically unidirectionalpulse current, which may be referred to as steamed buns wave. FIG. 2illustrates a schematic diagram of a waveform of unidirectional pulsecurrent. The filter circuit filters the voltage and current outputtedfrom the rectifying circuit so as to obtain stable direct current(stable voltage value), and outputs the stable direct current into themobile terminal via a charging interface so as to charge the battery inthe mobile terminal.

An existing mobile terminal is typically supplied with power from alithium battery. If the battery in the mobile terminal is charged withthe above charge method, a lithium precipitation may occur frequently,which causes decreased service life of the battery.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to make technique solutions according to embodiments of thepresent disclosure more apparent, drawings needed to be used indescriptions of the embodiments will be illustrated in the following.Obviously, the drawings to be illustrated in the following onlyrepresent some embodiments of the present disclosure, and other drawingscan be obtained according these drawings by those having ordinary skillsin the related art without making creative labors.

FIG. 1 is a block diagram of an internal structure of an adapter in therelated art.

FIG. 2 is a schematic diagram of a waveform of unidirectional pulsecurrent.

FIG. 3 is a flow chart of a charge method according to an embodiment ofthe present disclosure.

FIG. 4 is a flow chart of a charge method according to an embodiment ofthe present disclosure.

FIG. 5 is a schematic diagram of a quick charging process according toan embodiment of the present disclosure.

FIG. 6 is a schematic flow chart of a quick charging process accordingto an embodiment of the present disclosure.

FIG. 7 is a schematic diagram of a waveform of unidirectional pulseoutput current.

FIG. 8 is a schematic diagram of a waveform of unidirectional pulseoutput current.

FIG. 9 is a block diagram of an adapter according to an embodiment ofthe present disclosure.

FIG. 10 is a block diagram of a mobile terminal according to anembodiment of the present disclosure.

DETAILED DESCRIPTION

In the related art, most adapters are non-intelligent adapters whichsimply convert the mains voltage into working voltage suitable forcharging a battery of a mobile terminal. In order to improve safety andcharging speed during the charging process, embodiments of the presentdisclosure may adopt an intelligent adapter, for example, the adaptermay be configured with a micro controller unit (MCU) internally. The MCUmay communicate with a mobile terminal, so as to negotiate with themobile terminal about a charging mode and charging parameters (such as,charging current, charging voltage) and to control the charging process.

The charging mode supported by the adapter and/or the mobile terminalmay include a conventional charging mode and a quick charging mode. Thecharging speed in the quick charging mode is greater than that in theconventional charging mode (for example, charging current in the quickcharging mode is greater than that in the conventional charging mode).Generally, the conventional charging mode may be understood as acharging mode in which a rated output voltage is 5V and a rated outputcurrent is less than or equal to 2.5 A. In addition, in the conventionalcharging mode, output ports D+ and D− of the adapter may beshort-circuited. However, the situation in the quick charging modeaccording to the present disclosure is different. In the quick chargingmode according to the present disclosure, the adapter may employ the D+and D− output ports to conduct communication and data exchange with themobile terminal. The charging current in the quick charging mode may begreater than 2.5 A, for example, may be 4.5 A or more. However, theconventional quick charging mode is not limited in the presentdisclosure. As long as the adapter supports two charging modes and thecharging speed (or current) in one charging mode is greater than that inthe other charging mode, the charging mode with a slower charging speedmay be configured as the conventional charging mode.

FIG. 3 is a flow chart of a charge method according to an embodiment ofthe present disclosure. As shown in FIG. 3, the charge method is appliedin the adapter, and includes following acts.

At block S310, after the adapter is coupled with the mobile terminal viaa charging interface, the adapter communicates with the mobile terminalto determine the charging mode.

The charging interface may be a common USB interface, or may be a microUSB interface, or other kinds of charging interfaces. Taking the USBinterface as an example, the power wire in the USB interface may includea Vbus wire and a ground wire. The data wire in the charging interfacemay include at least one of a D+ wire and a D− wire in the charginginterface. The power wire in the charging interface is configured tocharge a battery, and the data wire in the charging interface is usedfor communication between the adapter and the mobile terminal.

At block S320, when it is determined to charge the battery in the quickcharging mode, the adapter communicates with the mobile terminal todetermine a charging current corresponding to the quick charging mode.

At block S330, according to the charging current corresponding to thequick charging mode, the adapter adopts a unidirectional pulse outputcurrent to perform a first quick charging on the battery.

In an embodiment, a peak value of an initial waveform (for example, thefirst waveform, or first several waveforms) of the unidirectional pulseoutput current is equal to a current value of the charging currentcorresponding to the quick charging mode. In another embodiment, a meanvalue of an initial waveform of the unidirectional pulse output currentis equal to a current value of the charging current corresponding to thequick charging mode.

In this solution, the adapter negotiates with the mobile terminal aboutthe charging mode and the charging current of the battery. Whendetermining to charge the battery in the quick charging mode, theadapter adopts the unidirectional pulse output current to perform aquick charging on the battery, based on the negotiated charging current.The current intensity of the unidirectional pulse output current changesperiodically. Compared with constant current, the unidirectional pulseoutput current may reduce the possibility of lithium precipitation andimprove service life of the battery. In addition, compared with constantcurrent, the unidirectional pulse output current may reduce thepossibility and intensity of electric arc at a contact of the charginginterface, and improve service life of the charging interface.

Further, the usage of unidirectional pulse output current may decreasethe complexity of the adapter structure and reduce the bulk of theadapter. Specifically, in the related art, in order to acquire stablecurrent, the adapter typically includes a filter circuit. Since anelectrolytic capacitor in the filter circuit has a great bulk, the bulkof the entire adapter is large, such that it is inconvenient to carrythe adapter. In this solution, since the adapter outputs theunidirectional pulse current rather than constant current, the adaptermay directly convert the power after rectification and output thecurrent fluctuating in pulse to the system without the filter circuit,which may simplify the adapter structure.

In addition, the current with changing intensity may relief the heatingproblem of the adapter during the charging. Compared with constantcurrent, the current with changing intensity is beneficial to reducepolarization effect of the battery, improve the charging speed andreduce the heat emitted from the battery.

It can be understood that, adopting by the adapter the unidirectionalpulse output current to perform the first quick charging on the batterymay refer to that, the adapter adopts the unidirectional pulse outputcurrent to charge the battery in the quick charging mode, according tothe charging current corresponding to the quick charging mode.

It should be understood that, the unidirectional pulse output currenthas features that the direction is constant while the intensity variesover time.

In an embodiment, before the adapter adopts the unidirectional pulseoutput current to perform the first quick charging on the battery, theadapter may further communicate with the mobile terminal to determine acharging voltage corresponding to the quick charging mode, and adopts aunidirectional pulse output voltage to perform a second quick chargingon the battery, according to the charging voltage corresponding to thequick charging mode.

In an embodiment, a peak value of an initial waveform of theunidirectional pulse output voltage is equal to a voltage value of thecharging voltage corresponding to the quick charging mode. In anotherembodiment, a mean value of an initial waveform of the unidirectionalpulse output voltage is equal to a voltage value of the charging voltagecorresponding to the quick charging mode.

It should be understood that, before the adapter charges the battery inthe mobile terminal, the adapter may first negotiate with the mobileterminal about the charging voltage and the charging currentcorresponding to the quick charging mode. After the charging voltage andthe charging current corresponding to the quick charging mode aredetermined, the adapter may charge the battery according to thenegotiated charging voltage and charging current.

FIG. 4 is a flow chart of a charge method according to an embodiment ofthe present disclosure, the charge method is applied in the mobileterminal and include following acts.

At block S410, after the mobile terminal is coupled with the adapter viathe charging interface, the mobile terminal communicates with theadapter to determine the charging mode.

At block S420, the mobile terminal communicates with the adapter todetermine a charging current corresponding to the quick charging mode.

At block S430, the mobile terminal receives a unidirectional pulseoutput current from the adapter so as to perform a first quick chargingon the battery, in which the unidirectional pulse output current isdetermined by the adapter according to the charging currentcorresponding to the quick charging mode.

With respect to specific implements of the charge method in FIG. 4,reference may be made to that described above for the charge method inFIG. 3, which will not be elaborated here.

In order to initiate and adopt the quick charging mode, the adapter mayperform a quick charging communication process with the mobile terminal,for example, by one or more handshakes, so as to realize a quick chargeof the battery. The quick charging communication process and respectivestages contained in the quick charging process will be described belowin detail with reference to FIG. 5. It should be understood that, thecommunication steps or operations illustrated in FIG. 5 are merelyexemplary. Other operations or modifications of respective operationsillustrated in FIG. 5 may be implemented in embodiments of the presentdisclosure. In addition, respective steps in FIG. 5 may be executed inan order different from that presented in FIG. 5, and it is unnecessaryto execute all the operations illustrated in FIG. 5.

FIG. 5 is a schematic diagram of a quick charging process according toan embodiment of the present disclosure.

As illustrated in FIG. 5, the quick charging process may include fivestages.

Stage 1:

The mobile terminal may detect a type of the adapter through the D+ andD−. If it is detected that the adapter is a non-USB-type chargingdevice, current absorbed by the mobile terminal may be greater than apreset current threshold I2 (for example, 1A). If the adapter detectsthat current outputted from the adapter is greater than or equal to I2within a preset time period (for example, a continuous time period T1),the adapter considers that the terminal has completed identifying thetype of the adapter, and then initiates handshake communication betweenthe adapter and the mobile terminal, and sends an instruction 1 to askthe terminal whether to initiate the quick charging mode (or flashcharging).

If the adapter receives a reply instruction indicating that the mobileterminal does not agree to initiate the quick charging mode from themobile terminal, then the output current of the adapter is detectedagain. If the output current of the adapter is still greater than orequal to I2, then the adapter sends a request for asking the mobileterminal whether to initiate the quick charging mode again, and theabove steps in stage 1 are repeated, until the mobile terminal returns areply indicating that the mobile terminal agrees to initiate the quickcharging mode or the output current of the adapter is no longer greaterthan or equal to I2.

After the mobile terminal agrees to initiate the quick charging mode,the quick charging mode is initiated, and then the quick chargingcommunication process goes into stage 2.

Stage 2:

For the output voltage of the adapter, there may be several grades. Theadapter sends an instruction 2 to the mobile terminal for asking themobile terminal whether the output voltage of the adapter matches (orsuitable, i.e., suitable to be the charging voltage in the quickcharging mode).

If the mobile terminal returns a reply indicating that the outputvoltage of the adapter is higher, lower or suitable, for example theadapter receives a feedback indicating that the output voltage of theadapter is higher or lower from the mobile terminal, then the adapteradjusts the output voltage of the adapter by one grade, and sends theinstruction 2 to the mobile terminal again for asking the mobileterminal whether the output voltage of the adapter matches.

The above steps in stage 2 are repeated, until the mobile terminalreturns a reply indicating that the output voltage of the adapter is ata matching grade, and then the quick charging communication process goesinto stage 3.

Stage 3:

After the adapter receives a feedback indicating that the output voltageof the adapter matches from the mobile terminal, the adapter sends aninstruction 3 to the mobile terminal for inquiring a maximum chargingcurrent currently supported by the mobile terminal, the mobile terminalreturns the maximum charging current currently supported by itself tothe adapter, and then the quick charging communication process goes intostage 4.

Stage 4:

The adapter receives a feedback indicating the maximum charging currentcurrently supported by the mobile terminal from the mobile terminal, andthen the adapter may configure the output current thereof as a specifiedvalue and output the current. Then, the quick charging communicationprocess goes into a constant current stage.

Stage 5:

When the quick charging communication process goes into the constantcurrent stage, the adapter sends an instruction 4 at intervals to themobile terminal for inquiring a voltage of the battery, the mobileterminal may feedback the voltage of the battery in the mobile terminalto the adapter, and the adapter may judge, according to the feedbackindicating the voltage of the battery in the mobile terminal from themobile terminal, whether a poor contact occurs in the USB interface orwhether to decrease the charging current value of the mobile terminal.If the adapter determines that the poor contact occurs in the USBinterface, the adapter sends an instruction 5, and then the adapter isreset such that the quick charging communication process goes into stage1.

In an embodiment, in stage 1, when the mobile terminal replies to theinstruction 1, data in the reply instruction may carry data (orinformation) on the path impedance of the mobile terminal, and the dataon the path impedance of the mobile terminal may be used in stage 5 tojudge whether the poor contact occurs in the USB interface.

In an embodiment, in stage 2, the time period from when the mobileterminal agrees to initiate the quick charging mode to when the adapteradjusts the voltage to a suitable value may be controlled to be in acertain range, and if the time period exceeds a preset period, themobile terminal may determine that a request exception occurs and thenthe mobile terminal is reset quickly.

In an embodiment, in stage 2, the mobile terminal may return a feedbackindicating that the output voltage of the adapter is suitable to theadapter when the output voltage of the adapter is adjusted to a valuewhich is higher than the voltage of the battery by ΔV (ΔV is about200-500 mV).

In an embodiment, in stage 4, the adjusting speed of the output currentvalue of the adapter may be controlled to be in a certain range, suchthat an unusual interruption of the quick charge due to the too fastadjusting speed can be avoided.

In an embodiment, in stage 5, i.e., the constant current stage, thevariation amplitude of the output current value of the adapter may becontrolled to be within 5%.

In an embodiment, in stage 5, the adapter monitors the impedance of acharging loop in real time, i.e., the adapter monitors the impedance ofthe entire charging loop by measuring the output voltage of the adapter,the charging current and the read voltage of the battery in theterminal. If detected impedance of the charging loop>path impedance ofthe terminal+impedance of the quick charging data wire, it may beconsidered that a poor contact occurs in the USB interface, and then thequick charge is reset.

In an embodiment, after the quick charging mode is initiated, the timeinterval of communications between the adapter and the mobile terminalmay be controlled to be in a certain range, such that a reset of quickcharge can be avoided.

In an embodiment, the termination of the quick charging mode (or quickcharging process) may include a recoverable termination or anunrecoverable termination.

For example, if the mobile terminal detects that the battery is chargedfully or a poor contact occurs in the USB interface, the quick charge isterminated and reset, and the quick charging communication process goesinto stage 1. If the mobile terminal does not agree to initiate thequick charging mode, the quick charging communication process would notgo into stage 2, and this termination of the quick charging process maybe considered as an unrecoverable termination.

For example, if an exception occurs in the communication between themobile terminal and the adapter, the quick charge is terminated andreset, and the quick charging communication process goes into stage 1.After requirements for stage 1 are met, the mobile terminal agrees toinitiate the quick charging mode to recover the quick charging process,and this termination of the quick charging process may be considered asa recoverable termination.

For example, if the mobile terminal detects that an exception occurs inthe battery, the quick charging is terminated and reset, and the quickcharging communication process goes into stage 1. After the quickcharging communication process goes into stage 1, the mobile terminaldoes not agree to initiate the quick charging mode. Till the batteryreturns to normal and the requirements for stage 1 are met, the mobileterminal agrees to initiate the quick charging mode to recover the quickcharging process, and this termination of the quick charging process maybe considered as a recoverable termination.

An example of quick charging process will be described below withreference to FIG. 6. The whole process illustrated in FIG. 6substantially corresponds to the process illustrated in FIG. 5, which isnot described herein.

It can be seen from FIG. 6 that, the adapter is in a dedicated chargingport (DCP) mode (corresponding to the conventional charging mode, D+andD− may be short-circuited in this case) at first, and charges the mobileterminal. Before sending the instruction 1, the adapter may judgewhether the data wire is a quick charging data wire. There may be manyjudging methods. For example, an identification circuit is added intothe data wire, and the adapter identifies whether the data wire is thequick charging data wire by conducting information interaction with theidentification circuit. In addition, it should be noted that, in theentire quick charging process, when a communication exception or animpedance exception occurs, the adapter may quit the quick chargingprocess or may be reset.

The quick charging process between the adapter and the mobile terminalare described above in detail with reference to FIG. 5 and FIG. 6. Inorder to support the above mentioned quick charging process, theinternal structure of the adapter needs to be adjusted, some newcomponents and circuits including the MCU are introduced, which maycause increased bulk of the adapter. In order to decrease the bulk ofthe adapter, optimize the circuit structure in the adapter and improvethe charging performance, the internal filter circuit may be removedfrom the adapter, or the electrolytic capacitor with a great bulk in thefilter circuit may be removed.

In this way, after the adapter acquires the current from the mainssupply and rectifies the current, the adapter directly outputsunidirectional pulse current/voltage (for example, half-wavevoltage/current with the same frequency as that at the AC terminal,which may be referred to as steamed buns voltage/current) at the outputterminal without filtering of the electrolytic capacitor. Theunidirectional pulse current/voltage has the same frequency as the powersupply grid, for example, may be frequently-used 50 Hz or 60 Hz,however, the present disclosure is not limited thereto.

The quick charging communication process is described above withreference to FIG. 5 and FIG. 6. Before the adapter adopts the quickcharging mode, the adapter may charge the battery in the mobile terminalin the conventional charging mode (which may be referred to as standardcharge). In the conventional charging mode, the output current/voltageof the adapter may be the above mentioned unidirectional pulsecurrent/voltage, since the charging performance in the conventionalcharging mode may be improved in this way. Certainly, as animplementation, the adapter may filter the current in the conventionalcharging mode, so as to be compatible with the prior art. For example,in general, the filter circuit includes an electrolytic capacitor and acommon capacitor (such as solid capacitor) in parallel. Since theelectrolytic capacitor has a great bulk, the electrolytic capacitor inthe adapter may be removed and a capacitor with low capacitance may bereserved, so as to decrease the volume of the adapter. When theconventional charging mode is adopted, a branch circuit having thecapacitor may be controlled to be switched on for filtering the current,such that the output with small power is stable. When the quick chargingmode is adopted, the branch circuit having the common capacitor may becontrolled to be switched off to avoid damage to the capacitor due tothe standard-exceeding ripple current in the capacitor, such that theunidirectional pulse current is directly outputted without filtering.

FIG. 7 and FIG. 8 illustrate an example of a waveform of output currentof the adapter during a process changing from the conventional chargingmode to the quick charging mode. It should be understood that, thewaveform of voltage may be similar to that of current, which is notdescribed hereinafter.

In FIG. 8 and FIG. 8, I₁ represents a peak value of a waveform ofcurrent in the conventional charging mode, and I_(max) represents a peakvalue of a waveform of initial current in the quick charging mode. In anembodiment, I_(max) may be related to remaining electric quantity in thebattery or the voltage of the battery. For example, if the remainingelectric quantity in the battery is low (for example, less than 10%),I_(max) may be high, for example 4.5 A; if the remaining electricquantity in the battery is high (for example, higher than 80%), I_(max)may be low, for example 3A. The quick charging process may include aninitial process and a current falling process (here, refers to theentire quick charging process, certainly, if the remaining electricquantity in the battery is high, the quick charging process may go intothe current falling process directly). During the initial process, theadapter may remain the current at I_(max). During the current fallingprocess, the adapter may pull down the output current in a continuous orstaged way. For example, in a current falling way illustrated in FIG. 7,the waveform of the output current in a latter cycle has a peak valueless than the peak value in a former cycle. In the current falling wayillustrated in FIG. 8, the current falling process is divided into aplurality of stages. In each stage, the waveform of current remainsconstant, but a peak value of the waveform of the output current in alatter stage is less than that of the waveform in a former stage. Eachwaveform of current may occupy the same time period, and the frequencyof the current waveform may be frequently-used 50 Hz or 60 Hz, which issynchronous with the frequency of the power supply grid. If the currentreaches I_(max), it indicates that the quick charge goes into stage 5illustrated in FIG. 5. After the quick charge goes into stage 5, theadapter may interact the electric quantity of the battery (or voltage ofthe battery) with the mobile terminal, so as to guide the proceeding ofcurrent falling process.

The charge method according to embodiments of the present disclosure isdescribed above in detail with reference to FIGS. 1-8. The adapter andthe mobile terminal according to embodiments of the present disclosurewill be described below in detail with reference to FIGS. 9-10.

FIG. 9 is a block diagram of an adapter according to an embodiment ofthe present disclosure. It should be understood that, the adapter 700 inFIG. 9 may execute the above mentioned steps executable by the adapter,which are not described herein for simplicity. The adapter 700 in FIG. 7includes a communication control circuit 710 and a charging circuit 720.The communication control circuit 710 is configured to: communicate witha mobile terminal to determine a charging mode, after the adapter iscoupled with the mobile terminal via a charging interface, in which apower wire in the charging interface is configured to charge a battery,a data wire in the charging interface is used for communication betweenthe adapter and the mobile terminal, and the charging mode includes aquick charging mode and a conventional charging mode, in which acharging speed in the quick charging mode is greater than that in theconventional charging mode; communicate with the mobile terminal todetermine a charging current corresponding to the quick charging mode,under a situation of determining to charge the battery in the quickcharging mode; and adopt, according to the charging currentcorresponding to the quick charging mode, a unidirectional pulse outputcurrent to perform a quick charge on the battery via the chargingcircuit 720.

In an embodiment, during the quick charge, a peak value of an initialwaveform of the unidirectional pulse output current is equal to acurrent value of the charging current corresponding to the quickcharging mode.

In an embodiment, during the quick charge, a mean value of an initialwaveform of the unidirectional pulse output current is equal to acurrent value of the charging current corresponding to the quickcharging mode.

In an embodiment, the quick charge includes a current falling process.During the current falling process, a peak value of a latter one in twoadjacent waveforms of the unidirectional pulse output current is lessthan that of a former one in the two adjacent waveforms.

In an embodiment, the quick charge includes a current falling process.The current falling process is divided into a plurality of stagesincluding a first stage and a second stage adjacent to the first stage.The first stage is earlier than the second stage. A waveform of theunidirectional pulse output current remains constant within each of theplurality of stages. A peak value of a waveform of the unidirectionalpulse output current in the second stage is less than that of a waveformof the unidirectional pulse output current in the first stage.

In an embodiment, the communication control circuit 710 is furtherconfigured to communicate with the mobile terminal to determine acharging voltage corresponding to the quick charging mode, under asituation that the adapter 700 determines to charge the battery in thequick charging mode, and to adopt, according to the charging voltagecorresponding to the quick charging mode, a unidirectional pulse outputvoltage to perform a quick charge on the battery.

In an embodiment, during the quick charge, a peak value of an initialwaveform of the unidirectional pulse output voltage is equal to avoltage value of the charging voltage corresponding to the quickcharging mode.

In an embodiment, during the quick charge, a mean value of an initialwaveform of the unidirectional pulse output voltage is equal to avoltage value of the charging voltage corresponding to the quickcharging mode.

In an embodiment, the unidirectional pulse output current is a currentoutputted from a rectifying circuit in the adapter 700 without afiltering.

In an embodiment, the frequency f of the unidirectional pulse outputcurrent of the adapter 700 satisfies: 50 Hz≦f≦60 Hz.

FIG. 10 is a block diagram of a mobile terminal according to anembodiment of the present disclosure. It should be understood that, themobile terminal 800 in FIG. 10 may execute the above mentioned stepsexecutable by a mobile terminal, which are not described herein forsimplicity. The mobile terminal 800 includes a communication controlcircuit 810 and a charging circuit 820. The communication controlcircuit 810 is configured to: communicate with the adapter to determinea charging mode, after the mobile terminal is coupled with an adaptervia a charging interface, in which a power wire in the charginginterface is configured to charge a battery, a data wire in the charginginterface is used for communication between the mobile terminal 800 andthe adapter, and the charging mode includes a quick charging mode and aconventional charging mode, in which a charging speed in the quickcharging mode is greater than that in the common charging mode;communicate with the adapter to determine a charging currentcorresponding to the quick charging mode, under a situation ofdetermining to charge the battery in the quick charging mode; andreceive a unidirectional pulse output current from the adapter so as toperform a quick charge on the battery via the charging circuit, in whichthe unidirectional pulse output current is determined by the adapteraccording to the charging current corresponding to the quick chargingmode.

In an embodiment, during the quick charge, a peak value of an initialwaveform of the unidirectional pulse output current is equal to acurrent value of the charging current corresponding to the quickcharging mode.

In an embodiment, during the quick charge, a mean value of an initialwaveform of the unidirectional pulse output current is equal to acurrent value of the charging current corresponding to the quickcharging mode.

In an embodiment, the quick charge includes a current falling process.During the current falling process, a peak value of a latter one in twoadjacent waveforms of the unidirectional pulse output current is lessthan that of a former one in the two adjacent waveforms.

In an embodiment, the quick charge includes a current falling process.The current falling process is divided into a plurality of stagesincluding a first stage and a second stage adjacent to the first stage.The first stage is earlier than the second stage. A waveform of theunidirectional pulse output current within each of the plurality ofstages remains constant. A peak value of a waveform of theunidirectional pulse output current in the second stage is less thanthat of a waveform of the unidirectional pulse output current in thefirst stage.

In an embodiment, the communication control circuit 810 is furtherconfigured to communicate with the adapter to determine a chargingvoltage corresponding to the quick charging mode, under a situation ofdetermining to charge the battery in the quick charging mode, and toreceive a unidirectional pulse output voltage from the adapter so as toperform a quick charge on the battery, in which the unidirectional pulseoutput voltage is determined by the adapter according to the chargingvoltage corresponding to the quick charging mode.

In an embodiment, during the quick charge, a peak value of an initialwaveform of the unidirectional pulse output voltage is equal to avoltage value of the charging voltage corresponding to the quickcharging mode.

In an embodiment, during the quick charge, a mean value of an initialwaveform of the unidirectional pulse output voltage is equal to avoltage value of the charging voltage corresponding to the quickcharging mode.

In an embodiment, the unidirectional pulse output current is a currentoutputted from a rectifying circuit in the adapter without a filtering.

In an embodiment, the frequency f of the unidirectional pulse outputcurrent of the adapter 700 satisfies: 50 Hz≦f≦60 Hz.

Those skilled in the art can be aware that, units and algorithm steps inrespective examples described with reference to embodiments disclosed inthe present disclosure can be realized by electronic hardware orcombination of computer software and electronic hardware. Executingthese functions in hardware or software depends on particularapplications and design constraint conditions of the technicalsolutions. Technology professionals can use different methods to realizethe described functions for each particular application, which should beregarded as being within the scope of the present disclosure.

Those skilled in the art can understand clearly that, for convenienceand simplicity of description, specific working process of the abovesystem, devices and units may refer to corresponding process in theabove method embodiments, which will not be elaborated herein.

It should be understood that, the system, devices and method disclosedin several embodiments provided by the present disclosure can berealized in any other manner. For example, the device embodimentsdescribed above can be merely exemplary, for example, the units are justdivided according to logic functions. In practical implementation, theunits can be divided in other manners, for example, multiple units orcomponents can be combined or integrated into another system, or somefeatures can be omitted or not executed. In addition, the mutualcoupling or direct coupling or communication connection described ordiscussed can be via some interfaces, and indirect coupling orcommunication connection between devices or units may be electrical,mechanical or of other forms.

The units illustrated as separate components can be or not be separatedphysically, and components described as units can be or not be physicalunits, i.e., can be located at one place, or can be distributed ontomultiple network units. It is possible to select some or all of theunits according to actual needs, for realizing the objective ofembodiments of the present disclosure.

In addition, respective functional units in respective embodiments ofthe present disclosure can be integrated into one processing unit, orcan be present as separate physical entities. It is also possible thattwo or more than two units are integrated into one unit.

If the functions are realized in form of functional software units andare sold or used as separate products, they can be stored in a computerreadable storage medium. Based on this understanding, the parts of thetechnical solutions or the essential parts of the technical solutions(i.e. the parts making a contribution to the related art) can beembodied in form of software product, which is stored in a storagemedium, and includes several instruction used for causing a computerdevice (for example, a personal computer, a server or a network device)to execute all or part of steps in the methods described in respectiveembodiments of the present disclosure. The above storage medium may beany medium capable of storing program codes, including a USB flash disk,a mobile hard disk, a Read-Only Memory (ROM), a Random Access Memory(RAM), a disc, or a light disk.

The forgoing description is only directed to preferred embodiments ofthe present disclosure, but not used to limit the present disclosure.All modifications, equivalents, variants and improvements made withinthe spirit and principle of the present disclosure shall fall within theprotection scope of the present disclosure. Thus, the protection scopeof the present disclosure shall be limited by the protection scope ofthe claims.

What is claimed is:
 1. A charge method, comprising: after an adapter is coupled with a mobile terminal via a charging interface, communicating, by the adapter, with the mobile terminal to determine a charging mode, wherein the charging mode comprises a quick charging mode and a conventional charging mode, in which a charging speed in the quick charging mode is greater than that in the conventional charging mode; under a situation of determining to charge the battery in the quick charging mode, communicating, by the adapter, with the mobile terminal to determine a charging current corresponding to the quick charging mode; and adopting, by the adapter according to the charging current corresponding to the quick charging mode, a unidirectional pulse output current to perform a quick charge on the battery.
 2. The method according to claim 1, wherein, during the quick charge, a peak value of an initial waveform of the unidirectional pulse output current is equal to a current value of the charging current corresponding to the quick charging mode, or a mean value of an initial waveform of the unidirectional pulse output current is equal to a current value of the charging current corresponding to the quick charging mode.
 3. The method according to claim 1, wherein, the quick charge comprises a current falling process, and in the current falling process, a peak value of a latter one in two adjacent waveforms of the unidirectional pulse output current is less than that of a former one in the two adjacent waveforms.
 4. The method according to claim 1, wherein, the quick charge comprises a current falling process, the current falling process is divided into a plurality of stages comprising a first stage and a second stage adjacent to the first stage, in which the first stage is earlier than the second stage, a waveform of the unidirectional pulse output current remains constant within each of the plurality of stages, a peak value of a waveform of the unidirectional pulse output current in the second stage is less than that of a waveform of the unidirectional pulse output current in the first stage.
 5. The method according to claim 1, wherein, before adopting, by the adapter according to the charging current corresponding to the quick charging mode, a unidirectional pulse output current to perform a quick charge on the battery, the method further comprises: under a situation that the adapter determines to charge the battery in the quick charging mode, communicating, by the adapter, with the mobile terminal to determine a charging voltage corresponding to the quick charging mode; and adopting, by the adapter according to the charging voltage corresponding to the quick charging mode, a unidirectional pulse output voltage to perform a quick charge on the battery.
 6. The method according to claim 5, wherein, during the quick charge, a peak value of an initial waveform of the unidirectional pulse output voltage is equal to a voltage value of the charging voltage corresponding to the quick charging mode, or a mean value of an initial waveform of the unidirectional pulse output voltage is equal to a voltage value of the charging voltage corresponding to the quick charging mode.
 7. The method according to claim 1, wherein, the unidirectional pulse output current is a current outputted from a rectifying circuit in the adapter without a filtering, and/or a pulse frequency of the unidirectional pulse output current is same with a frequency of an alternating current power supply grid.
 8. An adapter, comprising a communication control circuit and a charging circuit, wherein, the communication control circuit is configured to: communicate with a mobile terminal to determine a charging mode, after the adapter is coupled with the mobile terminal via a charging interface, wherein the charging mode comprises a quick charging mode and a conventional charging mode, in which a charging speed in the quick charging mode is greater than that in the conventional charging mode; communicate with the mobile terminal to determine a charging current corresponding to the quick charging mode, under a situation of determining to charge the battery in the quick charging mode; and adopt, according to the charging current corresponding to the quick charging mode, a unidirectional pulse output current to perform a quick charge on the battery via the charging circuit.
 9. The adapter according to claim 8, wherein, during the quick charge, a peak value of an initial waveform of the unidirectional pulse output current is equal to a current value of the charging current corresponding to the quick charging mode, or a mean value of an initial waveform of the unidirectional pulse output current is equal to a current value of the charging current corresponding to the quick charging mode.
 10. The adapter according to claim 8, wherein, the quick charge comprises a current falling process, and in the current falling process, a peak value of a latter one in two adjacent waveforms of the unidirectional pulse output current is less than that of a former one in the two adjacent waveforms.
 11. The adapter according to claim 8, wherein, the quick charge comprises a current falling process, and the current falling process is divided into a plurality of stages comprising a first stage and a second stage adjacent to the first stage, in which the first stage is earlier than the second stage, a waveform of the unidirectional pulse output current remains constant within each of the plurality of stages, a peak value of a waveform of the unidirectional pulse output current in the second stage is less than that of a waveform of the unidirectional pulse output current in the first stage.
 12. The adapter according to claim 8, wherein, the communication control circuit is further configured to: communicate with the mobile terminal to determine a charging voltage corresponding to the quick charging mode, under a situation that the adapter determines to charge the battery in the quick charging mode; and adopt, according to the charging voltage corresponding to the quick charging mode, a unidirectional pulse output voltage to perform a quick charge on the battery.
 13. The adapter according to claim 12, wherein, during the quick charge, a peak value of an initial waveform of the unidirectional pulse output voltage is equal to a voltage value of the charging voltage corresponding to the quick charging mode, or a mean value of an initial waveform of the unidirectional pulse output voltage is equal to a voltage value of the charging voltage corresponding to the quick charging mode.
 14. The adapter according to claim 8, wherein, the unidirectional pulse output current is a current outputted from a rectifying circuit in the adapter without a filtering, and/or a pulse frequency of the unidirectional pulse output current is same with a frequency of an alternating current power supply grid.
 15. A mobile terminal, comprising a communication control circuit and a charging circuit, wherein, the communication control circuit is configured to: communicate with the adapter to determine a charging mode, after the mobile terminal is coupled with an adapter via a charging interface, wherein the charging mode comprises a quick charging mode and a conventional charging mode, in which a charging speed in the quick charging mode is greater than that in the conventional charging mode; communicate with the adapter to determine a charging current corresponding to the quick charging mode, under a situation of determining to charge the battery in the quick charging mode; and receive a unidirectional pulse output current from the adapter so as to perform a quick charge on the battery via the charging circuit, wherein the unidirectional pulse output current is determined by the adapter according to the charging current corresponding to the quick charging mode.
 16. The mobile terminal according to claim 15, wherein, during the quick charge, a peak value of an initial waveform of the unidirectional pulse output current is equal to a current value of the charging current corresponding to the quick charging mode, or a mean value of an initial waveform of the unidirectional pulse output current is equal to a current value of the charging current corresponding to the quick charging mode.
 17. The mobile terminal according to claim 15, wherein, the quick charge comprises a current falling process, and in the current falling process, a peak value of a latter one in two adjacent waveforms of the unidirectional pulse output current is less than that of a former one in the two adjacent waveforms.
 18. The mobile terminal according to claim 15, wherein, the quick charge comprises a current falling process, and the current falling process is divided into a plurality of stages comprising a first stage and a second stage adjacent to the first stage, in which the first stage is earlier than the second stage, a waveform of the unidirectional pulse output current remains constant within each of the plurality of stages, a peak value of a waveform of the unidirectional pulse output current in the second stage is less than that of a waveform of the unidirectional pulse output current in the first stage.
 19. The mobile terminal according to claim 15, wherein, the communication control circuit is further configured to: communicate with the adapter to determine a charging voltage corresponding to the quick charging mode, under a situation of determining to charge the battery in the quick charging mode; and receive a unidirectional pulse output voltage from the adapter so as to perform a quick charge on the battery, wherein the unidirectional pulse output voltage is determined by the adapter according to the charging voltage corresponding to the quick charging mode.
 20. The mobile terminal according to claim 19, wherein, during the quick charge, a peak value of an initial waveform of the unidirectional pulse output voltage is equal to a voltage value of the charging voltage corresponding to the quick charging mode, or a mean value of an initial waveform of the unidirectional pulse output voltage is equal to a voltage value of the charging voltage corresponding to the quick charging mode. 